guruguru ぐるぐる

In Japanese, guruguru ぐるぐる means "swirling" or "spinning." It's a mimetic word featuring reduplication, generally used as an adverb to refer to something that's done by swirling around, or looks like it swirls around.

じゃあ不老不死にしてください（わく）はい！（ドン）そんなあっさりできるものなのか素晴らしいでは体の中をマナがぐるぐるぐるぐる循環して老いることのない体にいたしましょう！（ぐるぐる）他には？

Manga: Slime Taoshite 300-nen, Shiranai Uchi ni Level Max ni Nattemashita スライム倒して300年、知らないうちにレベルMAXになってました (Chapter 1, レベルＭＡＸになっていた)

Context: an angel is granting any desires to a soul about to be reincarnated.
jaa furou-fushi ni shite-kudasai
じゃあ不老不死にしてください
Then, please make [me] immortal.
- furou-fushi
  不老不死
  Non-aging, non-dying. (yojijukugo 四字熟語)
  Perpetually young and immortal.
- ~ni suru
  ～にする
  To make something somehow. To turn something into something else. (among other meanings.)
waku
わく
*excited* (psychomime)
hai!
はい！
Okay!
don
ドン
*bam*
{sonna assari dekiru} mono nanoka
そんなあっさりできるものなのか
It's something [that] {can be done so easily}?
subarashii
素晴らしい
Marvelous.
dewa karada no naka wo mana ga guruguru guruguru junkan shite {{oiru} koto no nai} karada ni itashimashou!
では体の中をマナがぐるぐるぐるぐる循環して老いることのない体にいたしましょう！
Then, let's make the mana circulate around and around through inside of [your] body, and turn [it] into a body [that] {never {ages}}.
- wo を particle - marks the medium through which movement happens.
- mana
  マナ
  Common term for magical energy in role-playing games. Also known as MP, magic points, magic power.
- oiru
  老いる
  To age. To grow old.
- ~koto ga nai
  ～ことがない
  To never [do something]. (to never age).
- ~koto no nai
  ～ことのない
  (same as above, see: no の subject marker.)
- ~ni itashimasu
  ～にいたします
  (humble variant of ~ni suru.)
guruguru
ぐるぐる
*swirling motion*
hoka niwa?
他には？
[Anything else]?